From cee89e70a6011c3fcae29ad95d5fec4b2026d055 Mon Sep 17 00:00:00 2001 From: Sona Kurazyan Date: Thu, 25 Nov 2021 11:08:01 +0100 Subject: Add example showing the benefits of using bindable properties Added two examples for modeling a subscription service: signal/slot connection-based and bindable property-based. The examples are based on the example from Fabian's Qt WS talk about the bindable properties. Pick-to: 6.2 Task-number: QTBUG-97655 Change-Id: I0345913b8b6e5c40b8477e128d36483598bdfcaa Reviewed-by: Qt CI Bot Reviewed-by: Ivan Solovev Reviewed-by: Fabian Kosmale --- .../bindablesubscription/bindablesubscription.cpp | 90 ++++++++++++++++++++++ 1 file changed, 90 insertions(+) create mode 100644 examples/corelib/bindableproperties/bindablesubscription/bindablesubscription.cpp (limited to 'examples/corelib/bindableproperties/bindablesubscription/bindablesubscription.cpp') diff --git a/examples/corelib/bindableproperties/bindablesubscription/bindablesubscription.cpp b/examples/corelib/bindableproperties/bindablesubscription/bindablesubscription.cpp new file mode 100644 index 0000000000..d962216cd9 --- /dev/null +++ b/examples/corelib/bindableproperties/bindablesubscription/bindablesubscription.cpp @@ -0,0 +1,90 @@ +/**************************************************************************** +** +** Copyright (C) 2021 The Qt Company Ltd. +** Contact: https://www.qt.io/licensing/ +** +** This file is part of the examples of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:BSD$ +** Commercial License Usage +** Licensees holding valid commercial Qt licenses may use this file in +** accordance with the commercial license agreement provided with the +** Software or, alternatively, in accordance with the terms contained in +** a written agreement between you and The Qt Company. For licensing terms +** and conditions see https://www.qt.io/terms-conditions. For further +** information use the contact form at https://www.qt.io/contact-us. +** +** BSD License Usage +** Alternatively, you may use this file under the terms of the BSD license +** as follows: +** +** "Redistribution and use in source and binary forms, with or without +** modification, are permitted provided that the following conditions are +** met: +** * Redistributions of source code must retain the above copyright +** notice, this list of conditions and the following disclaimer. +** * Redistributions in binary form must reproduce the above copyright +** notice, this list of conditions and the following disclaimer in +** the documentation and/or other materials provided with the +** distribution. +** * Neither the name of The Qt Company Ltd nor the names of its +** contributors may be used to endorse or promote products derived +** from this software without specific prior written permission. +** +** +** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS +** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT +** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR +** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT +** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, +** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT +** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, +** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY +** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT +** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE +** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE." +** +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#include "bindablesubscription.h" +#include "bindableuser.h" + +BindableSubscription::BindableSubscription(BindableUser *user) : m_user(user) +{ + Q_ASSERT(user); + + m_price.setBinding([this] { return qRound(calculateDiscount() * m_duration * basePrice()); }); + + m_isValid.setBinding([this] { + return m_user->country() != BindableUser::None && m_user->age() > 12; + }); +} + +void BindableSubscription::setDuration(Duration newDuration) +{ + m_duration = newDuration; +} + +double BindableSubscription::calculateDiscount() const +{ + switch (m_duration) { + case Monthly: + return 1; + case Quarterly: + return 0.9; + case Yearly: + return 0.6; + } + Q_ASSERT(false); + return -1; +} + +int BindableSubscription::basePrice() const +{ + if (m_user->country() == BindableUser::None) + return 0; + + return (m_user->country() == BindableUser::Norway) ? 100 : 80; +} -- cgit v1.2.3